Editing How to choose a camshaft (section)
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==The valve train== Mechanically speaking, the '''camshaft''' is linked to the crankshaft and turns 1/2 the speed of the crank. As the cam turns, the eccentric-shaped '''cam lobe''' lifts and lowers a cam follower, or [http://www.crankshaftcoalition.com/wiki/Lifters '''lifter''']. The lifter is linked to a fulcrum, or [http://www.crankshaftcoalition.com/wiki/Rocker_arms '''rocker arm'''] by a [http://www.crankshaftcoalition.com/wiki/Pushrods '''pushrod''']. The rocker arm directs the motion of the cam lobe to the '''valve''', lifting the valve open and closing it shut with the aid of the '''valve spring(s)'''. The shape of the cam lobe dictate when the valve opens and closes in relation to crankshaft position (aka the '''cam timing'''), and how far the valve is opened (aka the '''valve lift'''), as well as how long the valve is open and closed (aka the '''duration'''). This article assumes that the basics of how and what a camshaft does is understood. If further explanation or a refresher is needed, see [http://www.dragzine.com/news/camshaft-101/ '''Camshaft 101: How do cams work?''']. The article and video will make many of the ideas and terms used in this article much clearer. For some more advanced information on camshaft operation and definition the specs of a camshaft, see [http://www.carcraft.com/techarticles/ccrp_9812_secrets_of_camshaft_power/index.html '''Secrets of Camshaft Power'''] by Marlan Davis (Car Craft, December, 1998).
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